Method of burning off glassware



Sept. 24, 1940. C w, $HRE|BER 2,215,980

METHOD OF BURNING OFF GLASSWARE Filed April 7, 1939 3 Sheets-Sheet l C.WJc/axeiher INVENTOR.

Sept. 24, 1940. c. w. SCHREIBER METHOD OF BURNING OFF GLASSWARE FiledApril 7, 1939 3 Sheets-Sheet 2 IN V EN TOR. C W ,cizrjezer' M 7 A TTORS.

Sept. 24, 1940. Q w, SCHREBER 2,215,980

METHOD OF BURNING OFF GLASSWARE Filed April 7, 1939 I 3 Sheets-sheaf. 3

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Patented Sept. 24, 1940 PATENT OFFICE.

METHOD OF BURNING OFF GLASSWARE Carl W. Schreiber, Toledo, Ohio,assignor to Libbey Glass Company, a corporation of Ohio ApplicationApril 7, 1939, Serial No. 266,578

2 Claims;

The present invention relates to a method of and an apparatus forburning ofi glassware and more particularly to the type of apparatusshown and described in the patent to Parker No. 1,577,- 538, dated March23, 1926, wherein the article is held substantially stationary while theburner is moved relative thereto during the burning-01f process.

The invention is designed as an improvement over the apparatus disclosedin the Parker patent in that means is provided for stretching the wallof the article in the region of the severing flame to avoid theformation of a bead on the rim of the article after the moil is severedfrom the article.

This being the principal object of the invention, other objects thereofwill become apparent as the following description ensues.

In the accompanying drawings:

Fig. 1 is a vertical sectional view taken longitudinally and centrallyon a vertical plane through an apparatus embodying the principles of thepresent invention; 7

Fig. 2 is a sectional view, diagrammatic in its representation, of avalve structure and an associated burner structure with the former inposition for applying cooling air to the stretched wall of a tumbler;

Fig. 3 is a diagrammatic view similar to Fig. 2 with the valve structurein the position it occupies during the actual burn-off operation;

Fig. 4 is a diagrammatic view similar to Fig. 2 with the valve structurein position for flame treating the finished edge resulting from theburn-off operation;

Fig. 5 is another similar diagrammatic view illustrating. the tumblerand moil discharge;

Fig. 6 is an enlarged sectional view taken centrally and verticallythrough the valve structure;

Fig. 7 is an enlarged sectional view taken centrally and verticallythrough the burner structure; 6

Fig. 8 is a fragmentary sectional view taken through a tumbler wallillustrating the relative regions at which the tumbler wall is stretchedand at which the tumbler is severed from the moil; and

Fig. 9 is a fragmentary sectional view similar to Fig. 8 illustratingthe manner in which the stretched wall is burned through.

Referring now to Fig. 1, the apparatus infrom the table 20. The lowerends of the columns 24 are united by a cross-piece 25.

A bracket 26 depends from the rear side of the table 20 and provides abushing for a shaft 21. The shaft 21 constitutes the main driving shaftfor the machine and has mounted thereon a cam wheel 28 having a camgroove 29 therein. The bracket 26 is provided with a depending extension30 carrying a rock-shaft 32 at the lower end thereof and upon whichthere is fulcrumed a lever 3|. A roller 33 is mounted on the rear end ofthe lever 3| and operates in the cam groove 29. The front end of thelever 3| is connected by a link 34 to the article support 22. The link34 is directly pivoted to a block 35 which slides vertically in aguideway 36 provided in the article support 22. A pin 39extends upwardlyfrom the block 35 and is surrounded by a coil spring 40.

The article is directly supported upon a perforated plate 4| mounted onthe support 22 and a guide ring 42 surroundsthe article and is supportedby arms 43 extendingupwardly from the support 22. A vacuum chaniner 44is provided in the support 22 beneath the perforated plate 4| and isconnected by a flexible hose 45 with the inlet side of a valve casing46.

A pipe 41 leads from the casing 46 to a suitable source of vacuum suchas a vacuum pump (not shown). The passage through the valve casing 46 iscontrolled by means of a valve having a stem 48 which is normally urgedupwardly to close the valve by means of spring 49 surrounding the stem.The article support 22 carries a lug 56 designed for contact with thestem 48 when the support is in its lowermost position as will bedescribed hereinafter.

A column 5| extends upwardly from the table 20 and is provided with across-piece 52 at the upper end thereof. Pulleys 53' are rotatablymounted on the cross-piece 52 and a cable 53 passes thereover. A weight54. is attached to one end of the cable 53 and the other end of thelatter is connected to a rod 55 which is suspended from the cable. Amoil clutch 56 is secured to the lower end of the rod 55. The moilclutch 56 the column 5| and includes a central valve core 59 (see alsoFigs. 2 to 5 inclusive) and a surrounding valve sleeve 80. The core 59is slidably disposed in the sleeve 60 and is vertically slidable on therod 55 while the sleeve 60 is vertically slidable in the bracket 58. Theupper end of the sleeve 60 is closed and a spring 0| surrounds the rod55 and normally urges the core 59 downwardly and the sleeve 50 upwardly,or in other words, in opposite directions relative to each other. Thelower end of the core 59 projects through the sleeve 60 and is supportedupon a collar 62 mounted on the rod 55.

Movement of the sleeve 50 in the bracket 58 is controlled by means of acam 63 which engages a roller 64 rotatably supported at the upper endsof a pair of standards 55 (see also Fig. 6) mounted on the upper end ofthe sleeve 00. The cam 63 is mounted for rotation at the outer end of abracket 66 carried on the column 5| and is driven continuously through atrain of driving mechanism including bevel gears 61 and 58, a

' shaft 69, and bevel gears I0 and II, the latter gear being mounted onthe driving shaft 21.

Referring now to Figs. 1 and 7, the burner2| includes upper and lowerstationary carriers I2 and 13, the latter being integrally formed withthe table 20 and the former being secured to the latter. Bolted togetheras at H and thus being secured together for rotation as a unit is anupper air ring 15, a spacing ring 19, an inner oxygen-fuel gas ring I1,and a. lower supporting ring I8, the latter having teeth 19 formed onthe periphery thereof. The burner unit 15, I5, 11, 18 is driven from theshaft 21 through a train of driving mechanism including bevel gears 80-and 9|, vertical shaft 92, chain and sprocket mechanism 83, verticalshaft 84 and gear 85, the latter meshing with the teeth I9 on thesupporting ring 18.

An air conduit 86 leading from the valve 51 extends into the uppercarrier 12 and communicates through a passage 81 with an annular space88 or groove formed in the lower side of the air ring 15. A series ofradial passages 89 connect the space 88 with an annular air chamber 90the inner wall of which is provided with a series of apertures or airjets 92 by means of which cold air is adapted to be directed against thestretched wall of the tumbler as will be apparent presently.

An oxygen conduit 93 and a fuel gas conduit 90 extend into a union 95which in turn extends into the carrier 13 and communicates through apassage 96 with an annular space 91 or groove formed in the underneathside of the lower supporting ring 18. A series of passages 98 connectthe space 91 with an annular mixing chamber 99 provided in theoxygen-fuel gas ring 11. The inner wall of the chamber 99 is perforatedto provide a series of jets I00 by means of which flame is directedinwardly against the tumbler wall to sever the tumbler from the moil aswill presently appear.

Referring now to Figs. 1 and 6, the valve core 59 is formed with anannular groove I 0| designed for communication with a pair of ports I02and I03 formed in the valve sleeve 60 when the core 59 is retracted inthe sleeve 50 with the coil spring 6| compressed as shown in Fig. 2. Theport I02 communicates with a conduit I04 leading from a source ofcompressed air while the port I03 communicates with the air conduit 93leading to the burner 2|.

The groove IOI in the core 59 is also designed for communication with apair of ports Ill and I00 formed in the sleeve 00 when the core 50 is inits extended position with the spring 9| extended as shown in Figs. 3and 4. The port I05 communicates with a conduit I01 leading from asource of oxygen supply while the port I06 communicates with the oxygenconduit 98 leading to the burner.

A moil pan I08 is provided for receiving the burned oif moil as shown inFig. 5 and is capable of being swung to the position indicated in Fig. 1to discharge the moil therefrom in the manner set forth in the Parkerpatent previously mentioned.

The operation of the apparatus is as follows:

With the parts in the position shown in Fig. 1, an article resting onthe article support 4| is positioned within the burner 2| with the moilclutch engaging the moil portion thereof. Vacuum is applied to thechamber 40 through the conduit 45 to hold the article on the support 4|-The roller 84 which, together with the cam 69, controls the movements ofthe valve sleeve 50 is in engagement with a high portion of the cam andthus the sleeve 60 is depressed. The wall of the article beingcomparatively cool and rigid is not yet susceptible to stretching andconsequently the valve core 59 is in its lowermost position and isextended with respect to the relative positioning of the sleeve. Theannular groove ml is therefore in communication with the ports I05 andI05 and oxygen is conducted from the conduit I01 through the valve 51and conduit 93 to the burner to be mixed with fuel gas issuing from theconduit 94 and supplied to the jets I00.

During movement of the cam 63 from the angular position shown in Fig. 1to the angular position shown in Fig. 2, the roller travels on arelatively high circular portion of the former and during this time theburner 2| continues to direct the jets 100 of flame against a localizedarea of the article wall as shown at a in Fig. 8. As soon as thislocalized area becomes softened under the influence of heat, the weight.50, acting through the cable 53, rod 55 and moil clutch 56, causes thearticle wall to be stretched, thus drawing glass upwardly from theregion of localized heating as shown in Fig. 8. The extent of suchdrawing and stretching operation is determined by the travel of thevalve core 59 in the sleeve 60 and at such time as'the core is fullyretracted therein as shown in Fig. 2, such stretching will terminate.

As shown in Fig. 2, movement of the core 59 upwardly in the sleeve 50causes the groove to move out of register with the ports I05 and I00 andinto register with the ports I02 and I09. Thus the supply of oxygen tothe burner 2| is discontinued and air is admitted to the jets 92 thereoffrom the conduit I00, through the valve 51 and conduit 86. Such airserves to chill and set the stretched portion of the article wall.During the chilling operation, the discontinuance of the oxygen supplyto the burner 2| causes the flame to become ineffective although stillpresent in the jets I00.

As the cam 63 continues to rotate the roller 64 encounters a relativelylow region of the cam as shown in Fig. 3, and thus the valve sleeve 80is moved upwardly relative to the core 59 so that the groove I0| in thelatter again registers with the ports I05 and I05. The stretched portion11 of the article wall having previously been cooled and consequentlyset, renders the weight 54 ineffective to cause further stretchingthereof and CJI consequently the valve core 59 will remain stationaryinstead of following the upward movement of the valve sleeve 60. As soonas the groove H in the core 59 again registers with the ports I05 andI06, the flame is intensified by the admission of oxygen to the burnerand localized heat is applied to the region a of the article wall andthe tumbler is severed from the moil, as shown in Fig. 4.

Immediately after severing of the article in the manner previouslydescribed, the moil clutch 5B is elevated under the influence of theweight 54 until the clutch engages the stationary guide or abutment 56'.At such time, the spring 6| serves to maintain the core 59 extended fromthe sleeve as shown in Fig. 4 in order that the supply of oxygen to theburner may be continued long enough to glaze the thin edge of thetumbler, as shown additionally in Fig. 9.

Shortly thereafter the roller 64 engages an intermediate region of thecam 63 and the sleeve is partially depressed in such a manner that thegroove IOI registers with neither the ports I02, I03 nor the ports I05,I06. The supply of air and also of oxygen is thus terminated as shown inFig. 5, the article support 22 is lowered, and

the moil pan I08 is swung beneath the moil clutch 56 to receive the moilthereon.

Modifications may be resorted to within the spirit and scope of theappended claims.

I claim:

l. The method of burning off hollow glassware which consists in applyinga flame to a localized circumferential region extending around the wareto soften the glass in said region while simultaneously elongating thearticle a predetermined degree to stretch the softened glass anddiminish the thickness thereof, directing a blast of cooling air againstthe softened glass to chill and set the same, and thereafter applying acutting flame to the chilled glass.

2. The method of burning off hollow glassware which consists in applyinga flame to a localized circumferential region extending around the wareto soften the glass in said region while simultaneously elongating thearticle a predetermined degree to stretch the softened glass anddiminish the thickness thereof, chilling the softened glass ofdiminished thickness, and thereafter applying a cutting flame to thechilled glass.

CARL W. SCI-IREIBER.

